Meredith leitch



M. LEHCH. NHLKHJG MACHINE.

APPLlATmN FILED ubv. rs. 1mg. 1,196,000. PatentedAug. 29,1916.

Flay.

' Uiiiriin STATES- PAT n Frio i MER/EDITH LE'ITCH, 0F POUGHKEEPSIE, NEW YORK, Assienon rro THE nn Lavar.'

SEPARATOR COMPANY, A CQRPORATION F NEW YIEIB'SFFSLI Y To LZZ whom t may concern: l

had to the-accompanying drawings, whicn Y Be it known that I, Miinnni'rrr Liii'roH, a citizen of the United States, residing at Poughkeepsie, county Vof Dutchess, and State. of New York, have invented a new and useful Improvement in lVlilking-Machines, of which the following is a full, clear, and exact description, reference being form apart of this specification.

It is known, in milking machines, to provide means to compress two of the teats while pressure upon the other` two is released and alternately therewith to release the pressure upon the first-named t'eats and apply pressure to the other. two teats. For example, this has been eliected, in -double Y cha-mber teat cups, .by pneumatic means in complishing the .one pair of teat cups while exhausting into the milk discharge atmospheric air that has previouslyv been admitted into.-the inlators of'the other pair of teat cups, and 'to then reverse the process-admitting air to the inlat's of the second pair of teat cups and flators of the irst pair of teat' cups. VSuch a machine is set forth' in the applicationof Robert 'Bruce Forsyth, filed February 25, 1914, Serial No..820,81, but this process involves the possibility of some containinationof the milkby reason of the admission in contactftherewith of air that has been used to inflate the teat cups."

The objects'of my invention are to provide a milking machine, having the mode" of operationgand all the advantages ofthe Forsyth construction, in which there is no possibility of containinationlof the milk by Afoul air, and also to provide a sim .Mumien-MACHINE.

resented aw. ses, isis.-

Appiieatien sied November is, 1915.V serial Ne. sans,

A I nata apparatus which will lend itself to being mounted upon the pail-that is, aontaiiied within, or carried by, the'lid thereoi.

- A preferred embodiment of my invention is shown in the accompanyingj drawings,- in whichf y i Figure l is a diagrammatic View of a co1nplete installation. Fig. 2 is a section ot a 'pailtop and' pulsator valve, .the pipe con'- iiections thereto, the teat cups, and the connections between the latter and the valve. I

c is a vacuum pump adapted to exhaust air from a reservoir b,-

c isa safety valve that admits air to the reservoir whenever the vacuum is greater than desired. From the reservoir b a vacuum pipe line ci extends throughout the barn with cocks c at points convenient to the, stanchions.' A pulsation pipe line f with cocks f/ also extends through the barn and -is connected, b y a master valve 7i, with the .tank and the atmosphere alternately.

rle'valve z/ is driven from the saine power as the pump a. A, flexible pipe z' connects a passage r in the top of the milk pail with the vacuum pipe line cl. Another 'flexible pipe 7c connects the pulsation pipe f with a pulsator valve on the pail cover.

The cylinder of the pulsator valve has a large bore m and a small bore n, anda differential piston works iii these bores.Y The center of the cylinder is in communication with the passage 1*, the large end with the pulsation pipe 7c, and the sniallend with the atmosphere. From the side of `the small bore a a porttL opens toward the inators simultaneously exhausting; air from thevin- Iif'of rtwo teat cups (only one is. shown in the drawing).y From the side of the large bore m a port u opens toward the iniciators 'w of the other two cups. 'The large and smal-l heads of the differential piston are connected by a portion smaller in diameter than the smaller head. Around the middle of the large head is an ,annular passage o connected by a cross hole o with a central air from the tank 5,-'the pipeline the pipe i, the passage r, the pail j, the inner cham bers of the teat cups, and the dinerential partot' the pulsator valve; a check valve e4 and exceeded by atmospheric pressure on the area of the small piston, so that the dit/leren* tial piston moves to the position shown in the drawing. The inilator ot the left cup receives atmospheric pressure through port t and,because of 'the vacuum in the teat chamber, collai'ises and squeezes 'the teat.l expelling thc milk; while the inlator of the right cup is' exhausted through port u into the passage r and the Vacuum pipe i, -and the teat is allowed to hang free and till with milk. W hen atmospheric pressure exists in' the pipe line and passes into the large bore m, it is partly balanced by atmospheric pressure on the small piston but exceeds the pressure on the diiTerential area, so the pis ton moves to the lett. The .intlator or the leit cup is now connected with vacuum through the port, passage 7' and pipe find that of the right cup is connected with the atmosphere by the annular passage .In cross hole p and central h'ole g.

The check valve s in the connection -between the pail and the passage leading to the pipe a' prevents foul air from the teat cups entering the pail and contaminating the milk.

lVhile in the claims I refer, for the sake of simplicity, to only two teat cups, it will be understood that l intend more especially to cover a construction wherein each of these two cups is one of a pair.

Having now fully described my invention, what I claim and desire to protect by lietH ters Patent is: y i

l. n a milking machine, the combination with two flouble-chambered teat cups, of a pipe linel a vacuum line. a milk discharge lconnecting the. vacuum -line and the inner teat cup chambers, means to producel pneumatic pulsations in the rst line and a partial vacuum in the second line, and means controlled by said pneumatic pulsations to admit air to the inflation chamber of one cup while exhausting air from the inflation chamber of the other cup into the vacuum line independently of the milkv discharge, .and Vice versa.

2. In a milking machine, the combination with :we double-chambered teatcups, of a pulsation pipe line and a vacuum pipe line,

.incense and means to produce pneumatic pulsations in the first line and a partial vacuum in the second line, a milk discharge from the inner teat' cup chambers, means connecting the milk discharge and the vacuum line, a pul sator valve connected with, and whose operation is controlled by the pulsations in, the pulsation line, and ports and passages coperating with the valve to admit air to the outer chamber of one teat cup and exhaust air from the outer chamber of the other teat 'cup into the vacuum line independently of the milk discharge and alternately therewith to admit air into the outer chamber of the second teat cup and exhaust air from the outer chamber or the first teat cup into the Vacuum line independently of the milk dissages cooperating with the pulsator valve to admit air to the outer chamber of one teat cup and at the same time exhaust air from the outer chamber of the otherteat cup into the vacuum' line and vice versa.

l. in a milking machine, the combination with two double-chambered teat cups, of a. pulsation pipe line and a Vacuum pipe line, and means to produce pneumatic pulsations in the first line and a partial vacuum in the second line, of a -milk discharge from the inner teat cup chambers, a milk pail connected with the milk discharge, a check Valve between the vacuum line and the pail, a puh sator valve connected with, and whose operation is controlled by the pulsations in, the pulsation line, and ports and passages cop erating with the Valve to admit air to the outer chamber ot' one teat cup and at the same time exhaust air from the outer chamber or the other cup into' the vacuum line, and vice versa.

ln a. milking machine, the combination with two double-chambered teat cups, of a pulsation pipe line and a vacuum pipe line and means to produce pneumatic pulsations in the ilrst line and a partial vacuum in the second line, a milk pail, a milk discharge from the inner teat cup chambers to the pail, a check Valve between the vacuum line and the pail, a talve comprising a cylinder of two diameters and a differential valve piston reciprocable therein, the larger end ot the cylinder opening to the pulsation line and the smaller end to the atmosphere, the cylinder having two ports respeetiveiy in its larger and smaller ends, means for connecting said ports respectively with the outer chambers of the two teat cups, means to connect the 12u-ger end of thevcylinder with the vacuum line7 the lui-ger end of the piston being cut away to form a surrounding annular groove, the piston having a passage from itsv small end to said groove.v Y

In testimony of which invention; I have 10 hereunto set my hand, at Poughkeepsie,l

N; Y., on this 13' day of Nov., 1915.

MEREDHH LEITCH. 

